The inner piece (3) has tie webs (33) to both sides thereof, connected to each other by means of expanding webs (34), whereby an end piece (31) is further arranged on the inner piece (3).

In the unlatched position the upper tension straps loosely support the mask below the chin of the wearer in a parked position.

There is particularly disclosed a bridle tension indicator device which is attachable to one or both reins (R) of a bridle.

A pair of spring clips (64) within the cartridge housing maintains the ink ribbon (13) in tension.

The bellows surrounds a resilient element, preferably a helical tension spring, which is substantially co-axial with the bellows.

Each segment has laterally extending side flanges (108) through which longitudinally extend the pre-tensioned load-bearing cables.

The inner piece (3) has tie webs (33) to both sides thereof, connected to each other by means of expanding webs (34), whereby an end piece (31) is further arranged on the inner piece (3).

The coupling of the flanges to each other generates a tension force in each tension rod, whereby bending loads exerted by the spindles are shared between the housing and the tension rods.

In the unlatched position the upper tension straps loosely support the mask below the chin of the wearer in a parked position.

The tension meters were fitted behind the doors between the backstraps and the bridles.

The tensioning means may comprise a pair of straps with a hook and loop fastener, buckles or the like for the application of requisite tension at a controlled rate.

The flanges are preferably integrated to form connector-flange arrays (41) and coupling-flange arrays (42, 43).

Direct current with the voltage of 220 V to 400 V as well as the UN1 and UN2 control lines are connected to the clamps of the controlled relays.

The locking ring (8) has segments (12) which are movable relative to one antoher and which, by means of a spring arrangemnt (32), are resilientyl prestressed 8f9 to a first position in which the coupling members (20, 22) straddle the flanges (10, 11).

The towers may comprise a tower section (5), a pair of flanges (15, 15'), a plurality of tensioning cables (10A-10D)and at least one tensioner (30AB, 30CD).